Using assets with other assets

So I’m very very new to unity and I got some of the assets from the store to use and I’m not sure how I use them, like I got some guns but do I need to use them with a certain character model or do am I just not getting it. and do they come with animations or do I need to make them or download some animations. same with player animations can I use them with random character models or only certain ones. If anybody can help or link a video with a basic understanding of it all I would greatly appreciate it. Thanks also not sure if this is where i post it sorry if it isnt

Most assets don’t come with animations included, but you are free to use them however you like.
See this tutorial for adding free animations to any character models

Thank you that video helped a lot